Automatic gas cut-off



' April 6 1926. 1,580,033

H. GODFREY AUTOMATICGAS CUT-OFF Filed June l, 1925 2 Sheets-Sheet 2 INVEN TOR.

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Patented Apr. 6. 1926.

Sim

HARVEYfGoDFREY-,or NEWPORT, xENmcKY.'

` AUTQM-ATIC GAS' GUT-OFF,

Application mea rane 1, 1925. serial No. 34,048. y

T0 all whom tm/zy concern:

Be it knownv that l, HARVEYGODFREY, a citizen of the United States,`residing. at

Newport, in the county of! Campbell andl State ofl Kentucky, haveinvented certain new and useful Impro'f'einents in-Automatic' GasGuti-Offs, of.`wliich the following-is a specification. t

This invention relates to device' for con"- trolling'the supply of'gas,toautomatically shut off the flow 4in event oftheV pressure beingreduced from any cause to a degree siniicient to extinguish the iiameofthefhurners, and thus prevent the flow of' through vunlighted.burnersWhen the pressure-isili. sumed, ,and for 'one ofI itsY objects to liniprove and simplify the construction andincrelase the utility andeliiciency ofdevices ofiL this character.

invention consists in certainnovelfeatures of1 construction Vashereinafter shown and descrihedland then specifically pointed' out inthe claims, andin` the drawings illustra.- tive ofi-the preferred'einloodiinentA ofthel inventiony Fig.. 1'l is a side elevation oftheimproved device'.Y applied to. a conventional.' ga s heater, withL thepartsarranged' tol permit the fioW of gas through tlie'supply conductor.Figads fan eleva-tion :on an enlarged"scale,V and partly in section,illustratingtheoperation. i H Y. l

Figz is a'` detail in section on theline 3%3 of Fig.A 2.

t ig, 4- vis lafdetail 1in section yon the lined-ft 5f representsportionsx of' .the tripping:mechanisminperspective. l f

Theimprove'd5v device mayV he associated with anyy ofthe various makesof lgas heat# ing orI coolrling-apparatus, ,and itV is Avnot desiredtollimitthelrdevice.in any manner in this respect, butfor the'purposeof'illustration the `deif'ice issliown arranged in connectio-n-I with aconventional gaslheater in which the supply conductor-.is indicatedat`10, lrayingr aficontrolling valve at'p1'1 anda plurality/of burners-atl2 .1

The' impro'yeddeyice. includes a suita-ldle support, preferably inkth'ewform of casi-ng hay ig bott/omer floor portion lkhack Y tls15,'the-bottoni poiiftion 13,rest

f iiigzupoatheheater .trame"lofaljacexi't thel- Vith these andotherobjects'` in yiew,the

lrurners 12 andl in position to rec'eiyeU th'e heat radiated therefrom.

Pivoted to .swing atl 17' relative' 'to- "Ellie` haelt of the'casi'ng isai supportin'gplate 1t?y having spaced stops 19 coactingwith a pin'fexte'nding from the'casingitodimit thefthrmy' (5i-"movement of' theplate on its` v pivot.

Atl its oppositeend: the plate '.18 'is reduced'as shoWnat'Ql ,Y i

Attached to the plate 18 as by straps 122: Ais a curved tubular'container" 23 .enlarged at one end' as at '24, tof` contain anv` elementcapable of expansionloy heat, suclia's inercury, alcohol, or the' like?.The member 23 is p so located that its center line"is'bene'ath-tle pivot17, so that .when thefmediumgwithin the tube and its bulb'- 245isexpandedhy heat, the major portion Willp/ass to 'the rightV hand endo'fthe tube' and lovercel-ne'-tlie" -gravity ofthe plate 18" anddepress'the reduced endf21, l and. dispose the fplate' in the positionshowi'iinfull'lin'es in Fig.. 2'Witlithelo`wer projection 19 againstthe'pinf20."

The member EZBfis-thus atherinostat'ie elementi"v A l When the heat its?reduced the nifediuin Within the' tube Willcontract andl :dis-- ose themajor' portion of' the` ni'ediuin` at l the other side-of the line of`the piyot' 17,.and disposet the plate' 1S and its` tube" '23 iin*v theposition shown vin full 'lines inFigure 1`y and projection 19lagainsttliepin 20) Attached at v25 to tli'erear Wall 14.: ofthe casing,is a bracket 26 having" a. pi'vot pin 27 extending there-fromyand*mounted toV Another ystop pin 34' extends fron'ifthe. .member2'6Vland'spaced'from the pin 33, to

limit the downward'n'ioyeniei'it of tlie'gtrip plate TheportionBQ'ofrtheltrip'liriger extends intothe path `of the? portion 21Y ofy theplate 18,so`that as tlie'latter is tilted on its, pivot 17 hyyopei-a'tionof thev 'tliferifno stv-at djevcathe terminal 2'1.wi1lswmgt1ie trip .finger on" itspwot" and passteneathit,

but. n-thejateeetingthe ytrip plate QS,

Cil

but at the return movement ot the plate 18 caused by the reduction ofthe temperature, the point 21 will pick up the trip iinger and swing itagainst the stop pin 23 and actuate the trip plate 28, as hereafterexplained.

Pivoted at to the wall 14 ot the easing, is a lever arm 36, and pivotedat 37 to the arm 36 is a. stop latch 38 having a weighted end 39. i

rlhe terminal ot the member 38 is provided with a bearing roller 40 inposition to simultaneously engage the inclined tace ot the nose portion29 of the member 28 and the inclined `tace ot a projection on thebracket 26.

The operating arm 41 of the controlling valve 11 is provided with aweight 42, and is coupled to the lever arm 3G by a rod 43. A liftingring 44 is attached to the lever arm 36.

With an apparatus thus constructed and installed, the lever arm 36 iselevated tiret manually by the lifting ring 44 to open the valve 11 topermit the tiow ot gas to the burners 12, and the burners lighted.r1`his movement of the arm 36 causes the swinging stop latch 38--39 topass over both oit the nose portions 29 and 45 ot the plate 18 andbracket 2G, and assume the position shown in full lines in Figures 1 and2.

lVhen the heat from the burners expands the element within the tube 23,the plate 18 is tilted on its pivot 17 as before described and causesthe reduced terminals 21 to be .depressed int-o the position shown infull lines in Figure 2, this movement causing the point 21 to swing thetrip linger 32- 31 on Vits pivot, but without effecting the trip plate28.

The supporting plate 18 will retain the position shown in `full lin-esin Figure 2 s o long as the burners are lighted and radiate sntlieientheat to maintain the element within the tube 23 expanded.

Then the burners are turned ott, the cooling ot the element within thetube 23 will cause it to contract and move the center ot gravity to theother' side o't the pivot 17 and tilt the plate 18 and elevate thereduced portion 21 and canse it to engage the end 32 of the trip lingerand canse the latter in turn to engage the piu 33 and swing the tripplate 28 on its pivot 27 and depress theI nose portion 29 and cause theend ot the trip plate 28 to engage the roller 40 and detach the latchelement 38--39 Yfrom engagement with the nose portion 45 of the bracket2G, and thus release the lever arm 36 and eorrespondingly release theweighted valve lever 41 and permit the latter to close the valve 11, andcut ott the flow. This automatic action takes place when the flow to theburners is cut ott' eitherg manually or accidentally.

The improved device is primarily inten-ded to automatically cut ott thesupply of gas to the burners in event of the tiow being interrupted fromany cause so that when the pressure is restored, the gas will not reachthe burners and pass therethrough without being lighted.

By this simple arrangement Hm escape of gas through open unlighted gasburners or jets is effectually and automatically prevented whether suchescape is due to wind, interruption ot the gas pressure, overflow fromcooking vessels, carelessness, or any other causes.

The preferred embodiment oi the invention is disclosed in the drawingsand set forth in the specification, but it will beA understood thatmoditications within the scope ot' the claimed invention may be made inthe construction without departing from the principle of the inventionor saeritieing any o1" its advantages.

Having thus described my what l claim is 1. .In an automatic cut otl'tor gas burners, a controlling valve in the supply conductor adapted tobe closed by a weighted lever, a poised supporting member, athermostatic device coupled to said poised member and inventionoperative to control the movement thereof by change of temperature, aswinging arm connected to the weighted valve lever, a movable trip latchcarried by said swinging arm, a stationary inclined stop 45 engaged bysaid trip latch to hold said swinging Vlever arm in position to hold thevalve open, a swinging trip plate having a vertical terminal normallyengaging the trip latch, and

a trip ringer swinging vupon the trip platev and limited in its movementin one direction and extending into the path of the poised supportingplate.

2. A device ot the class described, comprising a support adapted to bedisposed within the influence oit heat radiated from gas burners, asupporting plate pivoted intermediate the ends relative to said support,a thermostatic device attached to said poised member and operative tocontrol the movement thereof by the heat from said burners, a lever armswinging at one end upon said support, a weight controlled valve in thegas conductor oit said burners, con necting means between the lever armand the weighted valve controlling means, and means whereby reduction ofthe tempera ture caused by the interrupted tlow to said burn ers willcanse the thermostatic device to close said valve.

3. A device of the class described comprising a stationary support, asupporting plate pivoted intermediate the ends relative to saidstationary support, a tubular member attached to said supporting plateand extending at each side of the pivot thereof, said tubular membercontaining an element expansible by heat and operative to swing thesupporting plate by expansion and contraction of said element, aconductor for gas, a controlling valve in said conductor, yieldablemeans for closing said valve, means for holding said valve controllingmeans in open position, and means operative by the contraction of saideX- pansible element to release said valve closing means.

4. A device ot' the class described comprising a Supporting platepivoted intermediate the ends, a tubular member attached to saidsupporting plate and extending at each side oli' the pivot thereof, saidtubular member containing an element expansible by heat and operative toswing the supporting platey by the expansion and contraction of saidelement, a conductor for gas, a controlling valve in said conductor,yieldable means for closing said valve, means for holding saidcontrolling mea-ns in open position, and means operative by thecontraction of said expansible'element to release said valve closingmeans.

5'. A device of the class described coinprising a supporting platepivoted intermediatefthe ends, a tubular member attached to saidsupporting plate and extending at eachy side of the pivot thereorlsaidytubular member containingy an element expansiblc by heat and operativeto swing the supporting plate by the expansion and con-- traction ofsaid element, a conductor for gas, a controlling valve insaid conductor,

yieldable means for closing said valve, a swinging lever arm coupled tosaid valve controlling means, a' trip latch swinging on saidr lever arm,a stationary bracket device having a portion operative to engage saidhelding latch and retain said lvalve control in open position todisengage the trip latch from the bracket projection, and a trip fingermovable upon said trip plate and extending into the path of said pivotedsupporting plate.y

In testimony whereof, I aiix my signature hereto.

.HARVEY GODFREY.

